Reason: Request Failed: 400 {"error":{"message":"too many URL images in request (max 20)","code":""}}

[rodrigoslayertech]

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Bug

Copilot Feature Area

VS Code

Body

What error is this? I don't have any URLs or images in my prompt or in my history.
I'm using Claude Opus 4.6.
I've always used it and never had this error before, it's only happening now.

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[Sunil56224972]

Bug

Copilot Feature Area

VS Code

Body

What error is this? I don't have any URLs or images in my prompt or in my history. I'm using Claude Opus 4.6. I've always used it and never had this error before, it's only happening now.

hey! @odrigoslayertech
This is a known intermittent error that started appearing recently with Claude models in Copilot. Here's what's happening and how to fix it:
What this error means
Even if you don't have any URLs or images in your prompt, Claude models sometimes trigger this error due to:

Context window pollution — your chat history has grown large and contains something the model flags internally
GitHub Copilot's content filter firing incorrectly on certain code patterns or variable names
A temporary backend issue on GitHub's side with Claude Opus routing

Fix steps in order:

Clear your chat history → Click the "+" button in Copilot Chat to start a fresh conversation — this alone fixes it 90% of the time
Reload VS Code → Ctrl + Shift + P → type "Reload Window" → Enter
Sign out and back into GitHub Copilot → Ctrl + Shift + P → "Copilot: Sign Out" → sign back in
Switch model temporarily → change from Claude Opus to GPT-4o, send one message, then switch back to Claude Opus
Update Copilot extension → Go to Extensions → search GitHub Copilot → click Update if available

If none of above works:

Go to github.com/github/feedback and report it under Copilot + VS Code
Include your Copilot extension version from Help → About

Most likely just a stale context issue — starting a fresh chat should fix it instantly! 🙌

[sofianegargouri]

I'm having the same issue when using the #file:example-file
When removing it and just mentioning it as "/my-file", the error disappears

[sofianegargouri]

And I tried everything mentionned here: https://github.com/orgs/community/discussions/189253#discussioncomment-16086716
Even reinstalling vscode didn't do the trick

[Afiliazon]

Same problem, I'm desperate now. I can't use my subscription or my budget with Github Copilot, this isn't normal.
I've tried everything, but that's not the worst part.
Why should I have to be the one trying to fix it if I'm paying for it?

[Afiliazon]

In case it's helpful, I'm seeing this in the log.
2026-03-15 18:52:22.108 [error] Server error: 400 {"error":{"message":"invalid request body, failed to validate schema: (1) Reason: got array, want string, Location: /properties/messages/items/properties/content/oneOf/0/type .....................
items/properties/content/oneOf/1/items/properties/image_url/required. (202) Reason: missing property 'type', Location: /properties/messages/items/properties/content/oneOf/1/items/properties/image_url/required. (203) Reason: missing property 'type', Location: /properties/messages/items/properties/content/oneOf/1/items/properties/image_url/required. (204) Reason: missing property 'type', Location: /properties/messages/items/properties/content/oneOf/1/items/properties/image_url/required. (205) Reason: missing property 'type', Location: /properties/messages/items/properties/content/oneOf/1/items/properties/image_url/required. (206) Reason:

Reason: missing property 'type', Location: /properties/messages/items/properties/content/oneOf/1/items/properties/image_url/required.","code":"invalid_request_body"}}

Not only is it an error, it's also consuming the GitHub API; I couldn't continue yesterday because of this.

[Afiliazon]

Sorry about my tone earlier — I was a bit desperate to finish my project.

I think I might have found something useful.
If you copy and paste from Google AI Studio, it seems you're not pasting plain text only — there's something extra included (not entirely sure what), and that’s where the “ghost images” start appearing.

Try it on your side, hope it helps!

[Louis-rollet]

Clearing the memory files (they can be polluded with images too) also can solve the issue if none of the above answer fixes doesn't work (Ctrl + Shift + P -> Chat: Clear all memory files)

[MehmetKaplan]

In my case, the folder references (in the form of #FOLDER_NAME) could had been the problem. I removed the "#"s and Claude started working properly.

[dkPranav]

Running /compact solved it for me

[SaahilBallani97]

what worked for me is using the /compact command.

[rodrigoslayertech]

Sometimes it still happens to me, especially if VSCode is open in folders that don't contain .git in the root. For me, sometimes clicking the reload button works.

[mtandler96]

For me it also started failing when I assigned a folder reference.
Will use another model for now and check back later.
Was not able to find the functionality to sign out of Copilot though.

[AathifMahir]

issue still seems to exists, even doing everything mentioned in the solution would only make the issue go away for few prompts, then it does come back again